java swing validate textfield

Question

I would like to know how I can validate a textfield for blood types.

For example, I have this, but I also need the negative symbol (-). Can somebody can help me?

Example input to validate:

A+ B+ AB+ O+ A- B- AB- O-

Code I have so far:

if(txtSangre.matches("(A|B|AB|O)\\+")==false){    
    mensaje("Ingresar un grupo sanguineo");
}

Answer 1

If you're looking to match one blood type, try this:

if (txtSangre.matches("(A|B|AB|O)(\\+|-)") == false) {    
    mensaje("Ingresar un grupo sanguineo");
}

It will match text A, B, AB, or O followed by either a plus (+) or a minus (-).

If you're looking to match a whole line of data separated by spaces as given in your question, use this regex pattern instead:

if (txtSangre.matches("^(\\s?(A|B|AB|O)(\\+|-)\\s?)+$") == false) {    
    mensaje("Ingresar un grupo sanguineo");
}